include/linux/filter.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Linux Socket Filter Data Structures
   4  */
   5 #ifndef __LINUX_FILTER_H__
   6 #define __LINUX_FILTER_H__
   7
   8 #include <stdarg.h>
   9
  10 #include <linux/atomic.h>
  11 #include <linux/refcount.h>
  12 #include <linux/compat.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/linkage.h>
  15 #include <linux/printk.h>
  16 #include <linux/workqueue.h>
  17 #include <linux/sched.h>
  18 #include <linux/capability.h>
  19 #include <linux/cryptohash.h>
  20 #include <linux/set_memory.h>
  21 #include <linux/kallsyms.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/vmalloc.h>
  24
  25 #include <net/sch_generic.h>
  26
  27 #include <asm/byteorder.h>
  28 #include <uapi/linux/filter.h>
  29 #include <uapi/linux/bpf.h>
  30
  31 struct sk_buff;
  32 struct sock;
  33 struct seccomp_data;
  34 struct bpf_prog_aux;
  35 struct xdp_rxq_info;
  36 struct xdp_buff;
  37 struct sock_reuseport;
  38 struct ctl_table;
  39 struct ctl_table_header;
  40
  41 /* ArgX, context and stack frame pointer register positions. Note,
  42  * Arg1, Arg2, Arg3, etc are used as argument mappings of function
  43  * calls in BPF_CALL instruction.
  44  */
  45 #define BPF_REG_ARG1    BPF_REG_1
  46 #define BPF_REG_ARG2    BPF_REG_2
  47 #define BPF_REG_ARG3    BPF_REG_3
  48 #define BPF_REG_ARG4    BPF_REG_4
  49 #define BPF_REG_ARG5    BPF_REG_5
  50 #define BPF_REG_CTX     BPF_REG_6
  51 #define BPF_REG_FP      BPF_REG_10
  52
  53 /* Additional register mappings for converted user programs. */
  54 #define BPF_REG_A       BPF_REG_0
  55 #define BPF_REG_X       BPF_REG_7
  56 #define BPF_REG_TMP     BPF_REG_2       /* scratch reg */
  57 #define BPF_REG_D       BPF_REG_8       /* data, callee-saved */
  58 #define BPF_REG_H       BPF_REG_9       /* hlen, callee-saved */
  59
  60 /* Kernel hidden auxiliary/helper register. */
  61 #define BPF_REG_AX              MAX_BPF_REG
  62 #define MAX_BPF_EXT_REG         (MAX_BPF_REG + 1)
  63 #define MAX_BPF_JIT_REG         MAX_BPF_EXT_REG
  64
  65 /* unused opcode to mark special call to bpf_tail_call() helper */
  66 #define BPF_TAIL_CALL   0xf0
  67
  68 /* unused opcode to mark call to interpreter with arguments */
  69 #define BPF_CALL_ARGS   0xe0
  70
  71 /* As per nm, we expose JITed images as text (code) section for
  72  * kallsyms. That way, tools like perf can find it to match
  73  * addresses.
  74  */
  75 #define BPF_SYM_ELF_TYPE        't'
  76
  77 /* BPF program can access up to 512 bytes of stack space. */
  78 #define MAX_BPF_STACK   512
  79
  80 /* Helper macros for filter block array initializers. */
  81
  82 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
  83
  84 #define BPF_ALU64_REG(OP, DST, SRC)                             \
  85         ((struct bpf_insn) {                                    \
  86                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,        \
  87                 .dst_reg = DST,                                 \
  88                 .src_reg = SRC,                                 \
  89                 .off   = 0,                                     \
  90                 .imm   = 0 })
  91
  92 #define BPF_ALU32_REG(OP, DST, SRC)                             \
  93         ((struct bpf_insn) {                                    \
  94                 .code  = BPF_ALU | BPF_OP(OP) | BPF_X,          \
  95                 .dst_reg = DST,                                 \
  96                 .src_reg = SRC,                                 \
  97                 .off   = 0,                                     \
  98                 .imm   = 0 })
  99
 100 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
 101
 102 #define BPF_ALU64_IMM(OP, DST, IMM)                             \
 103         ((struct bpf_insn) {                                    \
 104                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,        \
 105                 .dst_reg = DST,                                 \
 106                 .src_reg = 0,                                   \
 107                 .off   = 0,                                     \
 108                 .imm   = IMM })
 109
 110 #define BPF_ALU32_IMM(OP, DST, IMM)                             \
 111         ((struct bpf_insn) {                                    \
 112                 .code  = BPF_ALU | BPF_OP(OP) | BPF_K,          \
 113                 .dst_reg = DST,                                 \
 114                 .src_reg = 0,                                   \
 115                 .off   = 0,                                     \
 116                 .imm   = IMM })
 117
 118 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
 119
 120 #define BPF_ENDIAN(TYPE, DST, LEN)                              \
 121         ((struct bpf_insn) {                                    \
 122                 .code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),     \
 123                 .dst_reg = DST,                                 \
 124                 .src_reg = 0,                                   \
 125                 .off   = 0,                                     \
 126                 .imm   = LEN })
 127
 128 /* Short form of mov, dst_reg = src_reg */
 129
 130 #define BPF_MOV64_REG(DST, SRC)                                 \
 131         ((struct bpf_insn) {                                    \
 132                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
 133                 .dst_reg = DST,                                 \
 134                 .src_reg = SRC,                                 \
 135                 .off   = 0,                                     \
 136                 .imm   = 0 })
 137
 138 #define BPF_MOV32_REG(DST, SRC)                                 \
 139         ((struct bpf_insn) {                                    \
 140                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 141                 .dst_reg = DST,                                 \
 142                 .src_reg = SRC,                                 \
 143                 .off   = 0,                                     \
 144                 .imm   = 0 })
 145
 146 /* Short form of mov, dst_reg = imm32 */
 147
 148 #define BPF_MOV64_IMM(DST, IMM)                                 \
 149         ((struct bpf_insn) {                                    \
 150                 .code  = BPF_ALU64 | BPF_MOV | BPF_K,           \
 151                 .dst_reg = DST,                                 \
 152                 .src_reg = 0,                                   \
 153                 .off   = 0,                                     \
 154                 .imm   = IMM })
 155
 156 #define BPF_MOV32_IMM(DST, IMM)                                 \
 157         ((struct bpf_insn) {                                    \
 158                 .code  = BPF_ALU | BPF_MOV | BPF_K,             \
 159                 .dst_reg = DST,                                 \
 160                 .src_reg = 0,                                   \
 161                 .off   = 0,                                     \
 162                 .imm   = IMM })
 163
 164 /* Special form of mov32, used for doing explicit zero extension on dst. */
 165 #define BPF_ZEXT_REG(DST)                                       \
 166         ((struct bpf_insn) {                                    \
 167                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 168                 .dst_reg = DST,                                 \
 169                 .src_reg = DST,                                 \
 170                 .off   = 0,                                     \
 171                 .imm   = 1 })
 172
 173 static inline bool insn_is_zext(const struct bpf_insn *insn)
 174 {
 175         return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1;
 176 }
 177
 178 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
 179 #define BPF_LD_IMM64(DST, IMM)                                  \
 180         BPF_LD_IMM64_RAW(DST, 0, IMM)
 181
 182 #define BPF_LD_IMM64_RAW(DST, SRC, IMM)                         \
 183         ((struct bpf_insn) {                                    \
 184                 .code  = BPF_LD | BPF_DW | BPF_IMM,             \
 185                 .dst_reg = DST,                                 \
 186                 .src_reg = SRC,                                 \
 187                 .off   = 0,                                     \
 188                 .imm   = (__u32) (IMM) }),                      \
 189         ((struct bpf_insn) {                                    \
 190                 .code  = 0, /* zero is reserved opcode */       \
 191                 .dst_reg = 0,                                   \
 192                 .src_reg = 0,                                   \
 193                 .off   = 0,                                     \
 194                 .imm   = ((__u64) (IMM)) >> 32 })
 195
 196 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
 197 #define BPF_LD_MAP_FD(DST, MAP_FD)                              \
 198         BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
 199
 200 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
 201
 202 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)                      \
 203         ((struct bpf_insn) {                                    \
 204                 .code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),   \
 205                 .dst_reg = DST,                                 \
 206                 .src_reg = SRC,                                 \
 207                 .off   = 0,                                     \
 208                 .imm   = IMM })
 209
 210 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)                      \
 211         ((struct bpf_insn) {                                    \
 212                 .code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),     \
 213                 .dst_reg = DST,                                 \
 214                 .src_reg = SRC,                                 \
 215                 .off   = 0,                                     \
 216                 .imm   = IMM })
 217
 218 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
 219
 220 #define BPF_LD_ABS(SIZE, IMM)                                   \
 221         ((struct bpf_insn) {                                    \
 222                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,     \
 223                 .dst_reg = 0,                                   \
 224                 .src_reg = 0,                                   \
 225                 .off   = 0,                                     \
 226                 .imm   = IMM })
 227
 228 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
 229
 230 #define BPF_LD_IND(SIZE, SRC, IMM)                              \
 231         ((struct bpf_insn) {                                    \
 232                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,     \
 233                 .dst_reg = 0,                                   \
 234                 .src_reg = SRC,                                 \
 235                 .off   = 0,                                     \
 236                 .imm   = IMM })
 237
 238 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
 239
 240 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)                        \
 241         ((struct bpf_insn) {                                    \
 242                 .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,    \
 243                 .dst_reg = DST,                                 \
 244                 .src_reg = SRC,                                 \
 245                 .off   = OFF,                                   \
 246                 .imm   = 0 })
 247
 248 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
 249
 250 #define BPF_STX_MEM(SIZE, DST, SRC, OFF)                        \
 251         ((struct bpf_insn) {                                    \
 252                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,    \
 253                 .dst_reg = DST,                                 \
 254                 .src_reg = SRC,                                 \
 255                 .off   = OFF,                                   \
 256                 .imm   = 0 })
 257
 258 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
 259
 260 #define BPF_STX_XADD(SIZE, DST, SRC, OFF)                       \
 261         ((struct bpf_insn) {                                    \
 262                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,   \
 263                 .dst_reg = DST,                                 \
 264                 .src_reg = SRC,                                 \
 265                 .off   = OFF,                                   \
 266                 .imm   = 0 })
 267
 268 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
 269
 270 #define BPF_ST_MEM(SIZE, DST, OFF, IMM)                         \
 271         ((struct bpf_insn) {                                    \
 272                 .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,     \
 273                 .dst_reg = DST,                                 \
 274                 .src_reg = 0,                                   \
 275                 .off   = OFF,                                   \
 276                 .imm   = IMM })
 277
 278 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
 279
 280 #define BPF_JMP_REG(OP, DST, SRC, OFF)                          \
 281         ((struct bpf_insn) {                                    \
 282                 .code  = BPF_JMP | BPF_OP(OP) | BPF_X,          \
 283                 .dst_reg = DST,                                 \
 284                 .src_reg = SRC,                                 \
 285                 .off   = OFF,                                   \
 286                 .imm   = 0 })
 287
 288 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
 289
 290 #define BPF_JMP_IMM(OP, DST, IMM, OFF)                          \
 291         ((struct bpf_insn) {                                    \
 292                 .code  = BPF_JMP | BPF_OP(OP) | BPF_K,          \
 293                 .dst_reg = DST,                                 \
 294                 .src_reg = 0,                                   \
 295                 .off   = OFF,                                   \
 296                 .imm   = IMM })
 297
 298 /* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */
 299
 300 #define BPF_JMP32_REG(OP, DST, SRC, OFF)                        \
 301         ((struct bpf_insn) {                                    \
 302                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_X,        \
 303                 .dst_reg = DST,                                 \
 304                 .src_reg = SRC,                                 \
 305                 .off   = OFF,                                   \
 306                 .imm   = 0 })
 307
 308 /* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */
 309
 310 #define BPF_JMP32_IMM(OP, DST, IMM, OFF)                        \
 311         ((struct bpf_insn) {                                    \
 312                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_K,        \
 313                 .dst_reg = DST,                                 \
 314                 .src_reg = 0,                                   \
 315                 .off   = OFF,                                   \
 316                 .imm   = IMM })
 317
 318 /* Unconditional jumps, goto pc + off16 */
 319
 320 #define BPF_JMP_A(OFF)                                          \
 321         ((struct bpf_insn) {                                    \
 322                 .code  = BPF_JMP | BPF_JA,                      \
 323                 .dst_reg = 0,                                   \
 324                 .src_reg = 0,                                   \
 325                 .off   = OFF,                                   \
 326                 .imm   = 0 })
 327
 328 /* Relative call */
 329
 330 #define BPF_CALL_REL(TGT)                                       \
 331         ((struct bpf_insn) {                                    \
 332                 .code  = BPF_JMP | BPF_CALL,                    \
 333                 .dst_reg = 0,                                   \
 334                 .src_reg = BPF_PSEUDO_CALL,                     \
 335                 .off   = 0,                                     \
 336                 .imm   = TGT })
 337
 338 /* Function call */
 339
 340 #define BPF_CAST_CALL(x)                                        \
 341                 ((u64 (*)(u64, u64, u64, u64, u64))(x))
 342
 343 #define BPF_EMIT_CALL(FUNC)                                     \
 344         ((struct bpf_insn) {                                    \
 345                 .code  = BPF_JMP | BPF_CALL,                    \
 346                 .dst_reg = 0,                                   \
 347                 .src_reg = 0,                                   \
 348                 .off   = 0,                                     \
 349                 .imm   = ((FUNC) - __bpf_call_base) })
 350
 351 /* Raw code statement block */
 352
 353 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)                  \
 354         ((struct bpf_insn) {                                    \
 355                 .code  = CODE,                                  \
 356                 .dst_reg = DST,                                 \
 357                 .src_reg = SRC,                                 \
 358                 .off   = OFF,                                   \
 359                 .imm   = IMM })
 360
 361 /* Program exit */
 362
 363 #define BPF_EXIT_INSN()                                         \
 364         ((struct bpf_insn) {                                    \
 365                 .code  = BPF_JMP | BPF_EXIT,                    \
 366                 .dst_reg = 0,                                   \
 367                 .src_reg = 0,                                   \
 368                 .off   = 0,                                     \
 369                 .imm   = 0 })
 370
 371 /* Internal classic blocks for direct assignment */
 372
 373 #define __BPF_STMT(CODE, K)                                     \
 374         ((struct sock_filter) BPF_STMT(CODE, K))
 375
 376 #define __BPF_JUMP(CODE, K, JT, JF)                             \
 377         ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
 378
 379 #define bytes_to_bpf_size(bytes)                                \
 380 ({                                                              \
 381         int bpf_size = -EINVAL;                                 \
 382                                                                 \
 383         if (bytes == sizeof(u8))                                \
 384                 bpf_size = BPF_B;                               \
 385         else if (bytes == sizeof(u16))                          \
 386                 bpf_size = BPF_H;                               \
 387         else if (bytes == sizeof(u32))                          \
 388                 bpf_size = BPF_W;                               \
 389         else if (bytes == sizeof(u64))                          \
 390                 bpf_size = BPF_DW;                              \
 391                                                                 \
 392         bpf_size;                                               \
 393 })
 394
 395 #define bpf_size_to_bytes(bpf_size)                             \
 396 ({                                                              \
 397         int bytes = -EINVAL;                                    \
 398                                                                 \
 399         if (bpf_size == BPF_B)                                  \
 400                 bytes = sizeof(u8);                             \
 401         else if (bpf_size == BPF_H)                             \
 402                 bytes = sizeof(u16);                            \
 403         else if (bpf_size == BPF_W)                             \
 404                 bytes = sizeof(u32);                            \
 405         else if (bpf_size == BPF_DW)                            \
 406                 bytes = sizeof(u64);                            \
 407                                                                 \
 408         bytes;                                                  \
 409 })
 410
 411 #define BPF_SIZEOF(type)                                        \
 412         ({                                                      \
 413                 const int __size = bytes_to_bpf_size(sizeof(type)); \
 414                 BUILD_BUG_ON(__size < 0);                       \
 415                 __size;                                         \
 416         })
 417
 418 #define BPF_FIELD_SIZEOF(type, field)                           \
 419         ({                                                      \
 420                 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
 421                 BUILD_BUG_ON(__size < 0);                       \
 422                 __size;                                         \
 423         })
 424
 425 #define BPF_LDST_BYTES(insn)                                    \
 426         ({                                                      \
 427                 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
 428                 WARN_ON(__size < 0);                            \
 429                 __size;                                         \
 430         })
 431
 432 #define __BPF_MAP_0(m, v, ...) v
 433 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
 434 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
 435 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
 436 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
 437 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
 438
 439 #define __BPF_REG_0(...) __BPF_PAD(5)
 440 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
 441 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
 442 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
 443 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
 444 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
 445
 446 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
 447 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
 448
 449 #define __BPF_CAST(t, a)                                                       \
 450         (__force t)                                                            \
 451         (__force                                                               \
 452          typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long),      \
 453                                       (unsigned long)0, (t)0))) a
 454 #define __BPF_V void
 455 #define __BPF_N
 456
 457 #define __BPF_DECL_ARGS(t, a) t   a
 458 #define __BPF_DECL_REGS(t, a) u64 a
 459
 460 #define __BPF_PAD(n)                                                           \
 461         __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2,       \
 462                   u64, __ur_3, u64, __ur_4, u64, __ur_5)
 463
 464 #define BPF_CALL_x(x, name, ...)                                               \
 465         static __always_inline                                                 \
 466         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__));   \
 467         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__));         \
 468         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__))          \
 469         {                                                                      \
 470                 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
 471         }                                                                      \
 472         static __always_inline                                                 \
 473         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
 474
 475 #define BPF_CALL_0(name, ...)   BPF_CALL_x(0, name, __VA_ARGS__)
 476 #define BPF_CALL_1(name, ...)   BPF_CALL_x(1, name, __VA_ARGS__)
 477 #define BPF_CALL_2(name, ...)   BPF_CALL_x(2, name, __VA_ARGS__)
 478 #define BPF_CALL_3(name, ...)   BPF_CALL_x(3, name, __VA_ARGS__)
 479 #define BPF_CALL_4(name, ...)   BPF_CALL_x(4, name, __VA_ARGS__)
 480 #define BPF_CALL_5(name, ...)   BPF_CALL_x(5, name, __VA_ARGS__)
 481
 482 #define bpf_ctx_range(TYPE, MEMBER)                                             \
 483         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 484 #define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2)                              \
 485         offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
 486 #if BITS_PER_LONG == 64
 487 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 488         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 489 #else
 490 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 491         offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
 492 #endif /* BITS_PER_LONG == 64 */
 493
 494 #define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE)                            \
 495         ({                                                                      \
 496                 BUILD_BUG_ON(FIELD_SIZEOF(TYPE, MEMBER) != (SIZE));             \
 497                 *(PTR_SIZE) = (SIZE);                                           \
 498                 offsetof(TYPE, MEMBER);                                         \
 499         })
 500
 501 #ifdef CONFIG_COMPAT
 502 /* A struct sock_filter is architecture independent. */
 503 struct compat_sock_fprog {
 504         u16             len;
 505         compat_uptr_t   filter; /* struct sock_filter * */
 506 };
 507 #endif
 508
 509 struct sock_fprog_kern {
 510         u16                     len;
 511         struct sock_filter      *filter;
 512 };
 513
 514 struct bpf_binary_header {
 515         u32 pages;
 516         /* Some arches need word alignment for their instructions */
 517         u8 image[] __aligned(4);
 518 };
 519
 520 struct bpf_prog {
 521         u16                     pages;          /* Number of allocated pages */
 522         u16                     jited:1,        /* Is our filter JIT'ed? */
 523                                 jit_requested:1,/* archs need to JIT the prog */
 524                                 gpl_compatible:1, /* Is filter GPL compatible? */
 525                                 cb_access:1,    /* Is control block accessed? */
 526                                 dst_needed:1,   /* Do we need dst entry? */
 527                                 blinded:1,      /* Was blinded */
 528                                 is_func:1,      /* program is a bpf function */
 529                                 kprobe_override:1, /* Do we override a kprobe? */
 530                                 has_callchain_buf:1, /* callchain buffer allocated? */
 531                                 enforce_expected_attach_type:1; /* Enforce expected_attach_type checking at attach time */
 532         enum bpf_prog_type      type;           /* Type of BPF program */
 533         enum bpf_attach_type    expected_attach_type; /* For some prog types */
 534         u32                     len;            /* Number of filter blocks */
 535         u32                     jited_len;      /* Size of jited insns in bytes */
 536         u8                      tag[BPF_TAG_SIZE];
 537         struct bpf_prog_aux     *aux;           /* Auxiliary fields */
 538         struct sock_fprog_kern  *orig_prog;     /* Original BPF program */
 539         unsigned int            (*bpf_func)(const void *ctx,
 540                                             const struct bpf_insn *insn);
 541         /* Instructions for interpreter */
 542         union {
 543                 struct sock_filter      insns[0];
 544                 struct bpf_insn         insnsi[0];
 545         };
 546 };
 547
 548 struct sk_filter {
 549         refcount_t      refcnt;
 550         struct rcu_head rcu;
 551         struct bpf_prog *prog;
 552 };
 553
 554 DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
 555
 556 #define BPF_PROG_RUN(prog, ctx) ({                              \
 557         u32 ret;                                                \
 558         cant_sleep();                                           \
 559         if (static_branch_unlikely(&bpf_stats_enabled_key)) {   \
 560                 struct bpf_prog_stats *stats;                   \
 561                 u64 start = sched_clock();                      \
 562                 ret = (*(prog)->bpf_func)(ctx, (prog)->insnsi); \
 563                 stats = this_cpu_ptr(prog->aux->stats);         \
 564                 u64_stats_update_begin(&stats->syncp);          \
 565                 stats->cnt++;                                   \
 566                 stats->nsecs += sched_clock() - start;          \
 567                 u64_stats_update_end(&stats->syncp);            \
 568         } else {                                                \
 569                 ret = (*(prog)->bpf_func)(ctx, (prog)->insnsi); \
 570         }                                                       \
 571         ret; })
 572
 573 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
 574
 575 struct bpf_skb_data_end {
 576         struct qdisc_skb_cb qdisc_cb;
 577         void *data_meta;
 578         void *data_end;
 579 };
 580
 581 struct bpf_redirect_info {
 582         u32 flags;
 583         u32 tgt_index;
 584         void *tgt_value;
 585         struct bpf_map *map;
 586         struct bpf_map *map_to_flush;
 587         u32 kern_flags;
 588 };
 589
 590 DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
 591
 592 /* flags for bpf_redirect_info kern_flags */
 593 #define BPF_RI_F_RF_NO_DIRECT   BIT(0)  /* no napi_direct on return_frame */
 594
 595 /* Compute the linear packet data range [data, data_end) which
 596  * will be accessed by various program types (cls_bpf, act_bpf,
 597  * lwt, ...). Subsystems allowing direct data access must (!)
 598  * ensure that cb[] area can be written to when BPF program is
 599  * invoked (otherwise cb[] save/restore is necessary).
 600  */
 601 static inline void bpf_compute_data_pointers(struct sk_buff *skb)
 602 {
 603         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 604
 605         BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb));
 606         cb->data_meta = skb->data - skb_metadata_len(skb);
 607         cb->data_end  = skb->data + skb_headlen(skb);
 608 }
 609
 610 /* Similar to bpf_compute_data_pointers(), except that save orginal
 611  * data in cb->data and cb->meta_data for restore.
 612  */
 613 static inline void bpf_compute_and_save_data_end(
 614         struct sk_buff *skb, void **saved_data_end)
 615 {
 616         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 617
 618         *saved_data_end = cb->data_end;
 619         cb->data_end  = skb->data + skb_headlen(skb);
 620 }
 621
 622 /* Restore data saved by bpf_compute_data_pointers(). */
 623 static inline void bpf_restore_data_end(
 624         struct sk_buff *skb, void *saved_data_end)
 625 {
 626         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 627
 628         cb->data_end = saved_data_end;
 629 }
 630
 631 static inline u8 *bpf_skb_cb(struct sk_buff *skb)
 632 {
 633         /* eBPF programs may read/write skb->cb[] area to transfer meta
 634          * data between tail calls. Since this also needs to work with
 635          * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
 636          *
 637          * In some socket filter cases, the cb unfortunately needs to be
 638          * saved/restored so that protocol specific skb->cb[] data won't
 639          * be lost. In any case, due to unpriviledged eBPF programs
 640          * attached to sockets, we need to clear the bpf_skb_cb() area
 641          * to not leak previous contents to user space.
 642          */
 643         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
 644         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) !=
 645                      FIELD_SIZEOF(struct qdisc_skb_cb, data));
 646
 647         return qdisc_skb_cb(skb)->data;
 648 }
 649
 650 static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
 651                                          struct sk_buff *skb)
 652 {
 653         u8 *cb_data = bpf_skb_cb(skb);
 654         u8 cb_saved[BPF_SKB_CB_LEN];
 655         u32 res;
 656
 657         if (unlikely(prog->cb_access)) {
 658                 memcpy(cb_saved, cb_data, sizeof(cb_saved));
 659                 memset(cb_data, 0, sizeof(cb_saved));
 660         }
 661
 662         res = BPF_PROG_RUN(prog, skb);
 663
 664         if (unlikely(prog->cb_access))
 665                 memcpy(cb_data, cb_saved, sizeof(cb_saved));
 666
 667         return res;
 668 }
 669
 670 static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
 671                                        struct sk_buff *skb)
 672 {
 673         u32 res;
 674
 675         preempt_disable();
 676         res = __bpf_prog_run_save_cb(prog, skb);
 677         preempt_enable();
 678         return res;
 679 }
 680
 681 static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
 682                                         struct sk_buff *skb)
 683 {
 684         u8 *cb_data = bpf_skb_cb(skb);
 685         u32 res;
 686
 687         if (unlikely(prog->cb_access))
 688                 memset(cb_data, 0, BPF_SKB_CB_LEN);
 689
 690         preempt_disable();
 691         res = BPF_PROG_RUN(prog, skb);
 692         preempt_enable();
 693         return res;
 694 }
 695
 696 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
 697                                             struct xdp_buff *xdp)
 698 {
 699         /* Caller needs to hold rcu_read_lock() (!), otherwise program
 700          * can be released while still running, or map elements could be
 701          * freed early while still having concurrent users. XDP fastpath
 702          * already takes rcu_read_lock() when fetching the program, so
 703          * it's not necessary here anymore.
 704          */
 705         return BPF_PROG_RUN(prog, xdp);
 706 }
 707
 708 static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
 709 {
 710         return prog->len * sizeof(struct bpf_insn);
 711 }
 712
 713 static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
 714 {
 715         return round_up(bpf_prog_insn_size(prog) +
 716                         sizeof(__be64) + 1, SHA_MESSAGE_BYTES);
 717 }
 718
 719 static inline unsigned int bpf_prog_size(unsigned int proglen)
 720 {
 721         return max(sizeof(struct bpf_prog),
 722                    offsetof(struct bpf_prog, insns[proglen]));
 723 }
 724
 725 static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
 726 {
 727         /* When classic BPF programs have been loaded and the arch
 728          * does not have a classic BPF JIT (anymore), they have been
 729          * converted via bpf_migrate_filter() to eBPF and thus always
 730          * have an unspec program type.
 731          */
 732         return prog->type == BPF_PROG_TYPE_UNSPEC;
 733 }
 734
 735 static inline u32 bpf_ctx_off_adjust_machine(u32 size)
 736 {
 737         const u32 size_machine = sizeof(unsigned long);
 738
 739         if (size > size_machine && size % size_machine == 0)
 740                 size = size_machine;
 741
 742         return size;
 743 }
 744
 745 static inline bool
 746 bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
 747 {
 748         return size <= size_default && (size & (size - 1)) == 0;
 749 }
 750
 751 static inline u8
 752 bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default)
 753 {
 754         u8 access_off = off & (size_default - 1);
 755
 756 #ifdef __LITTLE_ENDIAN
 757         return access_off;
 758 #else
 759         return size_default - (access_off + size);
 760 #endif
 761 }
 762
 763 #define bpf_ctx_wide_access_ok(off, size, type, field)                  \
 764         (size == sizeof(__u64) &&                                       \
 765         off >= offsetof(type, field) &&                                 \
 766         off + sizeof(__u64) <= offsetofend(type, field) &&              \
 767         off % sizeof(__u64) == 0)
 768
 769 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
 770
 771 static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
 772 {
 773 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
 774         if (!fp->jited) {
 775                 set_vm_flush_reset_perms(fp);
 776                 set_memory_ro((unsigned long)fp, fp->pages);
 777         }
 778 #endif
 779 }
 780
 781 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
 782 {
 783         set_vm_flush_reset_perms(hdr);
 784         set_memory_ro((unsigned long)hdr, hdr->pages);
 785         set_memory_x((unsigned long)hdr, hdr->pages);
 786 }
 787
 788 static inline struct bpf_binary_header *
 789 bpf_jit_binary_hdr(const struct bpf_prog *fp)
 790 {
 791         unsigned long real_start = (unsigned long)fp->bpf_func;
 792         unsigned long addr = real_start & PAGE_MASK;
 793
 794         return (void *)addr;
 795 }
 796
 797 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
 798 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
 799 {
 800         return sk_filter_trim_cap(sk, skb, 1);
 801 }
 802
 803 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
 804 void bpf_prog_free(struct bpf_prog *fp);
 805
 806 bool bpf_opcode_in_insntable(u8 code);
 807
 808 void bpf_prog_free_linfo(struct bpf_prog *prog);
 809 void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
 810                                const u32 *insn_to_jit_off);
 811 int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
 812 void bpf_prog_free_jited_linfo(struct bpf_prog *prog);
 813 void bpf_prog_free_unused_jited_linfo(struct bpf_prog *prog);
 814
 815 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
 816 struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);
 817 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
 818                                   gfp_t gfp_extra_flags);
 819 void __bpf_prog_free(struct bpf_prog *fp);
 820
 821 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
 822 {
 823         __bpf_prog_free(fp);
 824 }
 825
 826 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
 827                                        unsigned int flen);
 828
 829 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
 830 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
 831                               bpf_aux_classic_check_t trans, bool save_orig);
 832 void bpf_prog_destroy(struct bpf_prog *fp);
 833
 834 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 835 int sk_attach_bpf(u32 ufd, struct sock *sk);
 836 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 837 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
 838 void sk_reuseport_prog_free(struct bpf_prog *prog);
 839 int sk_detach_filter(struct sock *sk);
 840 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
 841                   unsigned int len);
 842
 843 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
 844 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
 845
 846 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 847 #define __bpf_call_base_args \
 848         ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
 849          __bpf_call_base)
 850
 851 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
 852 void bpf_jit_compile(struct bpf_prog *prog);
 853 bool bpf_jit_needs_zext(void);
 854 bool bpf_helper_changes_pkt_data(void *func);
 855
 856 static inline bool bpf_dump_raw_ok(void)
 857 {
 858         /* Reconstruction of call-sites is dependent on kallsyms,
 859          * thus make dump the same restriction.
 860          */
 861         return kallsyms_show_value() == 1;
 862 }
 863
 864 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
 865                                        const struct bpf_insn *patch, u32 len);
 866 int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
 867
 868 void bpf_clear_redirect_map(struct bpf_map *map);
 869
 870 static inline bool xdp_return_frame_no_direct(void)
 871 {
 872         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 873
 874         return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
 875 }
 876
 877 static inline void xdp_set_return_frame_no_direct(void)
 878 {
 879         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 880
 881         ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
 882 }
 883
 884 static inline void xdp_clear_return_frame_no_direct(void)
 885 {
 886         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 887
 888         ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
 889 }
 890
 891 static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
 892                                  unsigned int pktlen)
 893 {
 894         unsigned int len;
 895
 896         if (unlikely(!(fwd->flags & IFF_UP)))
 897                 return -ENETDOWN;
 898
 899         len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
 900         if (pktlen > len)
 901                 return -EMSGSIZE;
 902
 903         return 0;
 904 }
 905
 906 /* The pair of xdp_do_redirect and xdp_do_flush_map MUST be called in the
 907  * same cpu context. Further for best results no more than a single map
 908  * for the do_redirect/do_flush pair should be used. This limitation is
 909  * because we only track one map and force a flush when the map changes.
 910  * This does not appear to be a real limitation for existing software.
 911  */
 912 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
 913                             struct xdp_buff *xdp, struct bpf_prog *prog);
 914 int xdp_do_redirect(struct net_device *dev,
 915                     struct xdp_buff *xdp,
 916                     struct bpf_prog *prog);
 917 void xdp_do_flush_map(void);
 918
 919 void bpf_warn_invalid_xdp_action(u32 act);
 920
 921 #ifdef CONFIG_INET
 922 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 923                                   struct bpf_prog *prog, struct sk_buff *skb,
 924                                   u32 hash);
 925 #else
 926 static inline struct sock *
 927 bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 928                      struct bpf_prog *prog, struct sk_buff *skb,
 929                      u32 hash)
 930 {
 931         return NULL;
 932 }
 933 #endif
 934
 935 #ifdef CONFIG_BPF_JIT
 936 extern int bpf_jit_enable;
 937 extern int bpf_jit_harden;
 938 extern int bpf_jit_kallsyms;
 939 extern long bpf_jit_limit;
 940
 941 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
 942
 943 struct bpf_binary_header *
 944 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
 945                      unsigned int alignment,
 946                      bpf_jit_fill_hole_t bpf_fill_ill_insns);
 947 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
 948 u64 bpf_jit_alloc_exec_limit(void);
 949 void *bpf_jit_alloc_exec(unsigned long size);
 950 void bpf_jit_free_exec(void *addr);
 951 void bpf_jit_free(struct bpf_prog *fp);
 952
 953 int bpf_jit_get_func_addr(const struct bpf_prog *prog,
 954                           const struct bpf_insn *insn, bool extra_pass,
 955                           u64 *func_addr, bool *func_addr_fixed);
 956
 957 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
 958 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
 959
 960 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
 961                                 u32 pass, void *image)
 962 {
 963         pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
 964                proglen, pass, image, current->comm, task_pid_nr(current));
 965
 966         if (image)
 967                 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
 968                                16, 1, image, proglen, false);
 969 }
 970
 971 static inline bool bpf_jit_is_ebpf(void)
 972 {
 973 # ifdef CONFIG_HAVE_EBPF_JIT
 974         return true;
 975 # else
 976         return false;
 977 # endif
 978 }
 979
 980 static inline bool ebpf_jit_enabled(void)
 981 {
 982         return bpf_jit_enable && bpf_jit_is_ebpf();
 983 }
 984
 985 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
 986 {
 987         return fp->jited && bpf_jit_is_ebpf();
 988 }
 989
 990 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
 991 {
 992         /* These are the prerequisites, should someone ever have the
 993          * idea to call blinding outside of them, we make sure to
 994          * bail out.
 995          */
 996         if (!bpf_jit_is_ebpf())
 997                 return false;
 998         if (!prog->jit_requested)
 999                 return false;
1000         if (!bpf_jit_harden)
1001                 return false;
1002         if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
1003                 return false;
1004
1005         return true;
1006 }
1007
1008 static inline bool bpf_jit_kallsyms_enabled(void)
1009 {
1010         /* There are a couple of corner cases where kallsyms should
1011          * not be enabled f.e. on hardening.
1012          */
1013         if (bpf_jit_harden)
1014                 return false;
1015         if (!bpf_jit_kallsyms)
1016                 return false;
1017         if (bpf_jit_kallsyms == 1)
1018                 return true;
1019
1020         return false;
1021 }
1022
1023 const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
1024                                  unsigned long *off, char *sym);
1025 bool is_bpf_text_address(unsigned long addr);
1026 int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
1027                     char *sym);
1028
1029 static inline const char *
1030 bpf_address_lookup(unsigned long addr, unsigned long *size,
1031                    unsigned long *off, char **modname, char *sym)
1032 {
1033         const char *ret = __bpf_address_lookup(addr, size, off, sym);
1034
1035         if (ret && modname)
1036                 *modname = NULL;
1037         return ret;
1038 }
1039
1040 void bpf_prog_kallsyms_add(struct bpf_prog *fp);
1041 void bpf_prog_kallsyms_del(struct bpf_prog *fp);
1042 void bpf_get_prog_name(const struct bpf_prog *prog, char *sym);
1043
1044 #else /* CONFIG_BPF_JIT */
1045
1046 static inline bool ebpf_jit_enabled(void)
1047 {
1048         return false;
1049 }
1050
1051 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1052 {
1053         return false;
1054 }
1055
1056 static inline void bpf_jit_free(struct bpf_prog *fp)
1057 {
1058         bpf_prog_unlock_free(fp);
1059 }
1060
1061 static inline bool bpf_jit_kallsyms_enabled(void)
1062 {
1063         return false;
1064 }
1065
1066 static inline const char *
1067 __bpf_address_lookup(unsigned long addr, unsigned long *size,
1068                      unsigned long *off, char *sym)
1069 {
1070         return NULL;
1071 }
1072
1073 static inline bool is_bpf_text_address(unsigned long addr)
1074 {
1075         return false;
1076 }
1077
1078 static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1079                                   char *type, char *sym)
1080 {
1081         return -ERANGE;
1082 }
1083
1084 static inline const char *
1085 bpf_address_lookup(unsigned long addr, unsigned long *size,
1086                    unsigned long *off, char **modname, char *sym)
1087 {
1088         return NULL;
1089 }
1090
1091 static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1092 {
1093 }
1094
1095 static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1096 {
1097 }
1098
1099 static inline void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
1100 {
1101         sym[0] = '\0';
1102 }
1103
1104 #endif /* CONFIG_BPF_JIT */
1105
1106 void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1107
1108 #define BPF_ANC         BIT(15)
1109
1110 static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1111 {
1112         switch (first->code) {
1113         case BPF_RET | BPF_K:
1114         case BPF_LD | BPF_W | BPF_LEN:
1115                 return false;
1116
1117         case BPF_LD | BPF_W | BPF_ABS:
1118         case BPF_LD | BPF_H | BPF_ABS:
1119         case BPF_LD | BPF_B | BPF_ABS:
1120                 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1121                         return true;
1122                 return false;
1123
1124         default:
1125                 return true;
1126         }
1127 }
1128
1129 static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1130 {
1131         BUG_ON(ftest->code & BPF_ANC);
1132
1133         switch (ftest->code) {
1134         case BPF_LD | BPF_W | BPF_ABS:
1135         case BPF_LD | BPF_H | BPF_ABS:
1136         case BPF_LD | BPF_B | BPF_ABS:
1137 #define BPF_ANCILLARY(CODE)     case SKF_AD_OFF + SKF_AD_##CODE:        \
1138                                 return BPF_ANC | SKF_AD_##CODE
1139                 switch (ftest->k) {
1140                 BPF_ANCILLARY(PROTOCOL);
1141                 BPF_ANCILLARY(PKTTYPE);
1142                 BPF_ANCILLARY(IFINDEX);
1143                 BPF_ANCILLARY(NLATTR);
1144                 BPF_ANCILLARY(NLATTR_NEST);
1145                 BPF_ANCILLARY(MARK);
1146                 BPF_ANCILLARY(QUEUE);
1147                 BPF_ANCILLARY(HATYPE);
1148                 BPF_ANCILLARY(RXHASH);
1149                 BPF_ANCILLARY(CPU);
1150                 BPF_ANCILLARY(ALU_XOR_X);
1151                 BPF_ANCILLARY(VLAN_TAG);
1152                 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1153                 BPF_ANCILLARY(PAY_OFFSET);
1154                 BPF_ANCILLARY(RANDOM);
1155                 BPF_ANCILLARY(VLAN_TPID);
1156                 }
1157                 /* Fallthrough. */
1158         default:
1159                 return ftest->code;
1160         }
1161 }
1162
1163 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1164                                            int k, unsigned int size);
1165
1166 static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
1167                                      unsigned int size, void *buffer)
1168 {
1169         if (k >= 0)
1170                 return skb_header_pointer(skb, k, size, buffer);
1171
1172         return bpf_internal_load_pointer_neg_helper(skb, k, size);
1173 }
1174
1175 static inline int bpf_tell_extensions(void)
1176 {
1177         return SKF_AD_MAX;
1178 }
1179
1180 struct bpf_sock_addr_kern {
1181         struct sock *sk;
1182         struct sockaddr *uaddr;
1183         /* Temporary "register" to make indirect stores to nested structures
1184          * defined above. We need three registers to make such a store, but
1185          * only two (src and dst) are available at convert_ctx_access time
1186          */
1187         u64 tmp_reg;
1188         void *t_ctx;    /* Attach type specific context. */
1189 };
1190
1191 struct bpf_sock_ops_kern {
1192         struct  sock *sk;
1193         u32     op;
1194         union {
1195                 u32 args[4];
1196                 u32 reply;
1197                 u32 replylong[4];
1198         };
1199         u32     is_fullsock;
1200         u64     temp;                   /* temp and everything after is not
1201                                          * initialized to 0 before calling
1202                                          * the BPF program. New fields that
1203                                          * should be initialized to 0 should
1204                                          * be inserted before temp.
1205                                          * temp is scratch storage used by
1206                                          * sock_ops_convert_ctx_access
1207                                          * as temporary storage of a register.
1208                                          */
1209 };
1210
1211 struct bpf_sysctl_kern {
1212         struct ctl_table_header *head;
1213         struct ctl_table *table;
1214         void *cur_val;
1215         size_t cur_len;
1216         void *new_val;
1217         size_t new_len;
1218         int new_updated;
1219         int write;
1220         loff_t *ppos;
1221         /* Temporary "register" for indirect stores to ppos. */
1222         u64 tmp_reg;
1223 };
1224
1225 struct bpf_sockopt_kern {
1226         struct sock     *sk;
1227         u8              *optval;
1228         u8              *optval_end;
1229         s32             level;
1230         s32             optname;
1231         s32             optlen;
1232         s32             retval;
1233 };
1234
1235 #endif /* __LINUX_FILTER_H__ */